Miner Names Co-Presidents Rather Than New CEO; Bigger Role for Chairman Thornton?

TORONTO—Chief Executive Jamie Sokalsky will leave Barrick Gold Corp. in September, the first management change at the world's largest gold-mining company since John Thornton became sole chairman in April.

Rather than name a new CEO, Barrick split the duties between two co-presidents. Investors said that was an unusual move, in which Mr. Thornton...